Extreme-ultraviolet spectroscopy of Fe VI-Fe XV and its diagnostic application for electron beam ion trap plasmas

Liang, G.Y. and Baumann, T.M. and Lopez-Urrutia, J.R.C. and Epp, S.W. and Tawara, H. and Gonchar, A. and Mokler, P.H. and Zhao, G. (2009) Extreme-ultraviolet spectroscopy of Fe VI-Fe XV and its diagnostic application for electron beam ion trap plasmas. Astrophysical Journal, 696 (2). pp. 2275-2289. ISSN 1538-4357 (http://dx.doi.org/10.1088/0004-637X/696/2/2275)

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Abstract

Extreme-ultraviolet spectra of intermediately ionized iron ions (Fe VI-Fe XIV) in the wavelength range of 125.0-265.0 Å have been measured at the Heidelberg electron beam ion trap. Emission spectra were recorded sequentially while varying the electron energy over the range of 75-544 eV in steps of 5 eV. The observed spectra clearly show the evolution of each ionic stage as a function of the electron energy, allowing to distinguish the emission lines from neighboring ion charge species and helping to disentangle possible line blends. The collisional-radiative modeling satisfactorily reproduces the measurement. A comparison with previous astrophysical observations (Sun) reveals that some weak emissions may originate from Fe VI and Fe VII, resulting in incorrect assignment of transition lines. The calculated polarization effects due to nonthermal (monoenergetic) electrons are found to be negligible for most of the emission lines at low-energy electron impact, except for a few lines whose polarization can be over 20%. By line ratio technique, the effective electron density in the trap was estimated to be 7.1+2.4 -3.0 × 109-3.4+0.5 -0.5 × 1010 cm-3, slightly depending on the ion charge state.

  • Item type:Article
    ID code:19157
    Dates:
    Date
    Event
    10 May 2009
    Published
    Notes:Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:21 May 2010 15:37
    Last modified:11 Nov 2024 09:25
    URI:https://strathprints.strath.ac.uk/id/eprint/19157
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